linux-kernel - [PATCH for-rc] RDMA/cma: Remove open coding for overflow in cma_connect

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1637599733-11096-1-git-send-email-haakon.bugge@oracle.com>
Date:   Mon, 22 Nov 2021 17:48:53 +0100
From:   Håkon Bugge <haakon.bugge@...cle.com>
To:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>
Cc:     Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH for-rc] RDMA/cma: Remove open coding for overflow in cma_connect_ib

The existing test is a little hard to comprehend. Use
check_add_overflow() instead.

Fixes: 04ded1672402 ("RDMA/cma: Verify private data length")
Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>
---
 drivers/infiniband/core/cma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 835ac54..0435768 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -4093,8 +4093,7 @@ static int cma_connect_ib(struct rdma_id_private *id_priv,
 
 	memset(&req, 0, sizeof req);
 	offset = cma_user_data_offset(id_priv);
-	req.private_data_len = offset + conn_param->private_data_len;
-	if (req.private_data_len < conn_param->private_data_len)
+	if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
 		return -EINVAL;
 
 	if (req.private_data_len) {
-- 
1.8.3.1